WO2005072905A1 - Procede de coupe de materiau a l'aide d'un systeme hybride a jet de liquide/laser - Google Patents

Procede de coupe de materiau a l'aide d'un systeme hybride a jet de liquide/laser Download PDF

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Publication number
WO2005072905A1
WO2005072905A1 PCT/US2005/002583 US2005002583W WO2005072905A1 WO 2005072905 A1 WO2005072905 A1 WO 2005072905A1 US 2005002583 W US2005002583 W US 2005002583W WO 2005072905 A1 WO2005072905 A1 WO 2005072905A1
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WO
WIPO (PCT)
Prior art keywords
stream
tube
cut
lead
laser
Prior art date
Application number
PCT/US2005/002583
Other languages
English (en)
Inventor
Steven J. Koch
Original Assignee
Boston Scientific Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Boston Scientific Limited filed Critical Boston Scientific Limited
Priority to CA002554893A priority Critical patent/CA2554893A1/fr
Priority to DE200560005446 priority patent/DE602005005446T2/de
Priority to EP20050712153 priority patent/EP1708845B1/fr
Priority to JP2006551470A priority patent/JP2007521966A/ja
Publication of WO2005072905A1 publication Critical patent/WO2005072905A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
    • B23K26/146—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor the fluid stream containing a liquid
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/04—Processes
    • Y10T83/0591—Cutting by direct application of fluent pressure to work
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/04—Processes
    • Y10T83/0596—Cutting wall of hollow work

Definitions

  • Implantable medical devices such as a stents, grafts, stent-grafts, vena cava filters and the like, and delivery assemblies are utilized in a number of medical procedures and situations, and as such their structure and function are well known.
  • Self-expanding, inflation expandable and hybrid stents are available in a variety of designs and configurations. Examples are disclosed in US 6348065, US 2002-0055770-A1 and US 6168621, incorporated herein by reference.
  • Stents are generally tubular but have been embodied in many different configurations and have been made of many materials, including metals and plastic.
  • Stents may also be made of bio-absorbable plastic materials. Stents may be formed from wire, flat sheets, tube stock, and the like.
  • a number of techniques have been suggested for the fabrication of stents from sheets and tubes. One such technique involves laser cutting a pattern into a sheet of material and rolling the sheet into a tube, or directly laser cutting the desired pattern into a tube. Other techniques involve cutting a desired pattern into a sheet or a tube via chemical etching or electrical discharge machining.
  • Laser cutting of stents has been described in a number of publications including US 5780807 to Saunders, US 5922005 to Richter and US 5906759 to Richter, the disclosures of which are incorporated herein by reference.
  • Other references wherein laser cutting of stents is described include: US 5514154, US 5759192, US 6131266 and US 6197048, the disclosures of which are incorporated herein by reference.
  • a typical laser cutting system relies on a laser to produce a beam which is conditioned as necessary via an optical unit and focused into a spot beam which is impinged against a hollow tube that is to become the stent.
  • the hollow tube may be moved via a rotational motor drive and linear motion drive.
  • An example of a conventional laser for cutting a stent is a highly focused pulsed Nd:YAG laser which has a pulse duration in the range of approximately 0.1 to 20 milliseconds. This is a long pulse time for cutting and characteristically produces a relatively large melt zone and heat affected zone (HAZ) on the metal.
  • the conventional laser cutting process typically results in the formation of melt dross on the inside edge of the cut tube or sheet. This dross must be cleaned off in subsequent processes.
  • Cutting and processing systems have been developed that incorporate a water column and laser.
  • SYNOVA Inc. of Lausanne, Switzerland, provides a laser-microjet that uses a laser beam that is contained within a water jet similar in principle to an optical fiber transmission.
  • the SYNOVA laser-microjet relies on a low pressure water column to contain the laser, to act as a cooling mechanism and to remove cutting debris.
  • the use of a hybrid liquid-jet/laser system such as the SYNOVA system to cut a stent presents new manufacturing concerns. Procedures which produce a satisfactory end product when using a conventional laser system are not generally applicable when using a hybrid liquid-jet/laser system. Thus, new procedures must be developed.
  • All US patents and applications and all other published documents mentioned anywhere in this application are incorporated herein by reference in their entirety. A brief summary of some of the claimed embodiments is set forth below. Additional details of the summarized embodiments and/or additional embodiments may be found in the Detailed Description below.
  • a brief abstract of the technical disclosure in the specification is provided as well only for the purposes of complying with 37 C.F.R. 1.72. The abstract is not intended to be used for interpreting the scope of the claims.
  • the present invention pertains to a method of providing one or more shaped openings through a material, the method comprising of a material having an interior portion, and providing a cutting device to cut the material with a hybrid liquid-jet/laser stream.
  • the hybrid stream may be impinged against the surface of the material while the material is moved relative to the stream at a first velocity.
  • the material may be moved relative to the stream at a second velocity, with at least a portion of the stream continuing to fully penetrate the material so as to provide an opening of a predetermined shape in the material.
  • the present invention comprises a method of providing one or more shaped openings through the wall of a tube of material comprising of a tube of material having a thickness and a cutting device to provide a hybrid liquid-jet/laser stream.
  • a cut lead-in may be established by moving the tube relative to the stream until the stream fully penetrates the thickness of the tube. Thereafter, the tube may be moved relative to the stream to provide a cut along a predetermined cut path.
  • the pulse rate and the pulse energy of the laser can be varied to reduce the lead-in path length required.
  • FIG. 1 is a perspective view of a hybrid liquid-jet/laser stream cutting through a material.
  • FIG. 2 is a perspective view of a hybrid liquid-jet/laser stream cutting through a material interior region using a lead-in.
  • FIG. 3 is a plan view of a lead-in cut.
  • FIG. 4 is a cross-sectional view of a lead-in cut.
  • FIG. 5 is a plan view of a material showing a stent cutout pattern, lead- in paths and final cut paths.
  • a hybrid liquid- jet/laser system comprises a liquid stream, a low pressure stream, and a laser beam.
  • the laser beam may be entrained within the liquid stream.
  • material ablated by the laser may be carried away by the liquid stream.
  • the liquid stream may immediately cool the surface, thereby reducing any heat affected zone (HAZ).
  • FIG. 1 depicts a hybrid liquid-jet/laser system 10 cutting a stock of material 20 using a laser 12 entrained within a column of liquid 14, or a hybrid liquid- jet/laser stream 16.
  • a cut 28 is generally accomplished having penetration through the full thickness of the material 20.
  • the width of the cut 28 is generally the same dimension as the diameter of the liquid column 14.
  • FIG. 1 depicts a material 20 having a cut 28 and a lead-in 30.
  • the aperture 32 comprises a penetration of the full thickness of the material 20, and generally has a diameter slightly larger than the diameter of the liquid column 14 of the hybrid stream 16. After the aperture 32 is cut, unless the material is very thin, the hybrid stream 16 will generally not penetrate the full thickness of the material 20 immediately upon displacement of the material 20 relative to the hybrid stream 16. Thus, a lead-in 30 path length will be traversed wherein only a partial penetration of the material 20 is accomplished.
  • the width of a lead-in 30 cut is generally slightly larger than the width of the water column 14 of the hybrid stream 16.
  • the depth of the lead-in 30 through the thickness of the material 20 generally increases with the distance traversed, although a jagged surface 34 having peaks and troughs can be created along the lead-in 30 path.
  • Figure 3 depicts a plan view of the aperture, lead in and full thickness cut of Fig. 2.
  • Figure 4 depicts a sectional view of an aperture 32, lead-in 30 and full thickness cut 28 achieved in a tube of material 20. The generally increasing depth of the lead-in 30 and a jagged surface 34 are best shown in the sectional view of Figure 4.
  • a full thickness cut 28 is achieved and may be maintained as long as the material 20 continues to be displaced with respect to the hybrid stream 16. If the displacement is stopped, an additional lead-in 30 is generally required before a full thickness cut 28 can again be achieved.
  • Figure 5 shows an outline stent pattern 40 which may be used to create a stent from a piece of material 20.
  • the pattern 40 forms an outline defining material to be removed 42 from the stock material 20.
  • the material to be removed 42 can be cut from the stock material 20 to form a plurality of cells 41.
  • a stent may be formed which comprises a generally cylindrical framework having a plurality of cells 41. Cells 41 are generally bounded by material 20 that is left according to the pattern 40, although cells 41 formed at the end regions of a stent are generally not entirely bounded by material 20.
  • the removed material 42 will generally become waste material and be discarded. Material to be removed 42 may further be described as a material zone 42 which will be removed.
  • a material zone 42 may comprise an edge zone 42a, which abuts an edge 22 of the material 20.
  • a material zone 42 may also comprise an interior zone 42b, wherein the eventual cell 41 must be formed by removing from an interior portion 42b of the material.
  • the cut 28 may begin from the edge 22 of the material 20, and the entirety of the cut 28 may be made along a final cut path 46.
  • material may also be removed from an edge zone 42a by beginning a cut 28 in an interior area of the edge zone 42a using a lead-in 30, using a procedure as described below.
  • a lead-in 30 should generally be used.
  • a lead-in path 44 is located in an interior zone 42b, or an area of eventual waste.
  • a lead-in path 44 may be as short as possible, and may be arranged to allow traversal of the final cut path 46 upon achieving a full thickness cut 28.
  • the hybrid stream 16 may be impinged against the wall surface of the material 20 to form an aperture 32. While fo ⁇ ning the aperture 32, an initial dwell can be beneficial in achieving a penetration of the full thickness of the material 20.
  • An initial dwell may be programmed into the motion control system, during which the material 20 remains stationary with respect to the hybrid stream 16.
  • An initial dwell will generally lead to an aperture 32 having a diameter slightly larger than the diameter of the liquid column 14.
  • An initial dwell ranges from 50 - 500 milliseconds.
  • the material 20 Upon achieving an aperture 32, the material 20 should immediately be displaced relative to the hybrid stream 16 to ensure a successful lead-in 30 and cut 28.
  • the hybrid stream 16 can be maneuvered along the final cut path 46.
  • a cell 41 may also be made by removing zone material 42 using two or more cuts. Thus, some zone material 42 may be removed with a first cut, and additional or remaining zone material 42 may be removed in one or more subsequent cuts. Removing portions of zones 42 may be desirable so that the stock material 20 may retain a greater amount of structural integrity during cutting. For example, when cutting a stent from a tube of material 20, it may be desirable to first cut a portion 48 of each zone 42 around the entire circumference of the tube, and then to remove the remainder of the zones 42.
  • a portion 48 of a zone 42 may be removed using a lead-in path 44, and cutting along a portion of a final cut path 46 after a lead-in 30 length has been traversed.
  • a lead-out path 50 is desirable.
  • a lead-out comprises a continuance of a full thickness cut 28 away from a final cut path 46 and into the interior of a zone 42.
  • a lead-out path 50 may join with a lead-in path 44 to complete removal of the portion 48 of material 20 from the zone 42.
  • a portion 48 of an adjacent zone 42 may then be removed.
  • Each zone 42 may be divided into multiple portions 48 as desired. When a portion 48 of an interior zone 42 is removed, the zone 42 is left with an opening or partial cell 38 and an interior edge portion 36.
  • the hybrid stream 16 may begin a cut 28 at an interior edge portion 36.
  • the cut 28 may be made along a final cut path 46, as a lead-in 30 is not necessary.
  • the length required for a lead-in 30 can change depending upon the material 20 being used, and the thickness of the material 20. Generally, a thinner piece of material 20 will require a shorter lead-in 30 than a thicker piece of the same material 20.
  • Any suitable material 20 may be used to form a medical device using the hybrid stream 16.
  • stents may be made from polymeric materials, metals, ceramics and composites. Suitable polymeric materials include thermotropic liquid crystal polymers (LCP's).
  • the metal may be stainless steel, cobalt chrome alloys such as elgiloy, tantalum, Zr or Nb or other plastically deformable metals.
  • suitable metals include shape-memory metals such as nickel-titanium alloys generically known as "Nitinol", platinum/tungsten alloys and titanium alloys. It has been found that cutting through a piece of Nitinol generally requires a longer lead-in 30 than when cutting through a piece of stainless steel of similar thickness.
  • the diameter of the liquid column 14 of the hybrid stream 16 can affect the lead-in 30. It is desirable to use as small a diameter liquid column 14 as possible that will support the laser 12 being used.
  • Example liquid column 14 diameters are 60 microns, 50 microns and 40 microns.
  • the flow rate of the liquid column 14 is generally varied according to the diameter. Varying the rate of displacement of the material 12 with respect to the hybrid stream 16 can affect the lead-in 30.
  • a slower rate of travel is desirable during initial piercing and lead-in 30, whereafter the speed may be increased.
  • An initial dwell may also be used during the initial piercing. For example, when the hybrid stream 16 is impinged against the material surface 20, there may be an initial dwell of 50 to 500 milliseconds. Thereafter, the material 20 may be moved at a rate of 0.05 inches per second with respect to the hybrid stream 16 during the lead-in 30. Upon full thickness penetration, a desired cutting speed may be used. The desired cutting speed may be 1 to 2 inches per second, or faster depending upon the particular motion control system being used. Varying the laser 12 pulse rate and pulse power can affect the lead-in 30.
  • a lower pulse repetition having higher peak energy may be desirable during the lead-in 30 for reducing the length of the lead-in 30.
  • the pulse repetition rate may be 11 - 14 kHz during the lead-in. Thereafter, the pulse repetition rate may be increased to 12 - 15 kHz.
  • a faster pulse repetition rate having lower peak energy may create a cleaner final cut 28.
  • the shape of the lead-in path 44 can be a straight line, but may be curved if desired.
  • Figure 5 shows two embodiments of curved lead-in paths: an arcuate lead-in path 52 and a spiral lead-in path 54.
  • a curved lead-in 30 may require a longer distance to be traversed than a straight lead-in 30 through the same material.
  • any dependent claim which follows should be taken as alternatively written in a multiple dependent form from all prior claims which possess all antecedents referenced in such dependent claim if such multiple dependent format is an accepted format within the jurisdiction (e.g. each claim depending directly from claim 1 should be alternatively taken as depending from all previous claims).
  • the following dependent claims should each be also taken as alternatively written in each singly dependent claim format which creates a dependency from a prior antecedent-possessing claim other than the specific claim listed in such dependent claim below.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Media Introduction/Drainage Providing Device (AREA)
  • Laser Beam Processing (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Laser Surgery Devices (AREA)

Abstract

Un dispositif hybride à jet de liquide/laser (10) peut être utilisé afin d'éliminer un matériau d'un tube ou d'une feuille pour former un dispositif médical tel qu'une prothèse endovasculaire. Le flux de jet de liquide/laser (16) peut être projeté contre la paroi du tube ou de la feuille entre les extrémités du tube ou de la feuille, une ouverture (32) pouvant être formée dans le tube ou dans la feuille suivie d'une entrée (30), et ensuite d'une coupe (28) en pleine épaisseur. Une coupe (28) en pleine épaisseur doit être obtenue par une entrée (30) avant de déplacer le flux de jet de liquide/laser sur un chemin de coupe finale (46).
PCT/US2005/002583 2004-01-28 2005-01-28 Procede de coupe de materiau a l'aide d'un systeme hybride a jet de liquide/laser WO2005072905A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CA002554893A CA2554893A1 (fr) 2004-01-28 2005-01-28 Procede de coupe de materiau a l'aide d'un systeme hybride a jet de liquide/laser
DE200560005446 DE602005005446T2 (de) 2004-01-28 2005-01-28 Verfahren zum schneiden von materialien mit hybrid-flüssigkeitsstrahl-/lasersystem
EP20050712153 EP1708845B1 (fr) 2004-01-28 2005-01-28 Procede de coupe de materiau a l'aide d'un systeme hybride a jet de liquide/laser
JP2006551470A JP2007521966A (ja) 2004-01-28 2005-01-28 材料を液体ジェット／レーザ・ハイブリッドシステムによって切断する方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/766,793 US7265317B2 (en) 2004-01-28 2004-01-28 Method of cutting material with hybrid liquid-jet/laser system
US10/766,793 2004-01-28

Publications (1)

Publication Number Publication Date
WO2005072905A1 true WO2005072905A1 (fr) 2005-08-11

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Country Link
US (1) US7265317B2 (fr)
EP (2) EP1708845B1 (fr)
JP (1) JP2007521966A (fr)
AT (2) ATE468938T1 (fr)
CA (1) CA2554893A1 (fr)
DE (2) DE602005021522D1 (fr)
WO (1) WO2005072905A1 (fr)

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US9421642B2 (en) 2010-03-09 2016-08-23 B. Braun Melsungen Ag Device for cutting plastic products provided in a continuous plastic band for use in the medical sector

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US7997226B2 (en) * 2006-10-18 2011-08-16 Innovational Holdings Llc Systems and methods for producing a medical device
JP4325679B2 (ja) * 2007-02-08 2009-09-02 株式会社デンソー ハニカム構造体成形用金型の製造方法
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JP6349588B2 (ja) * 2012-04-11 2018-07-04 クリノ株式会社 ステントの製造方法
DE102012208010A1 (de) * 2012-05-14 2013-11-14 Robert Bosch Gmbh Verfahren zur Herstellung einer Energiezelle und Vorrichtung zum Durchführen desselben
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EP1797988A1 (fr) 2007-06-20
EP1797988B1 (fr) 2010-05-26
US7265317B2 (en) 2007-09-04
ATE389498T1 (de) 2008-04-15
DE602005021522D1 (de) 2010-07-08
DE602005005446D1 (de) 2008-04-30
JP2007521966A (ja) 2007-08-09
ATE468938T1 (de) 2010-06-15
EP1708845A1 (fr) 2006-10-11
EP1708845B1 (fr) 2008-03-19
US20050160891A1 (en) 2005-07-28
DE602005005446T2 (de) 2008-11-27
CA2554893A1 (fr) 2005-08-11

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